2024-03-28T14:52:13Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1844482020-12-09T18:03:23Zcom_10261_89com_10261_3col_10261_342
Chemically modified STM tips for atomic-resolution imaging of ultrathin NaCl films
Li, Zhe
Schouteden, Koen
Iancu, Violeta
Janssens, Ewald
Lievens, Peter
Haesendonck, Chris Van
Cerdá, Jorge I.
German Research Foundation
China Scholarship Council
Ministerio de Ciencia e Innovación (España)
Ministerio de Economía y Competitividad (España)
STM simulation
Scanning tunneling microscopy (STM)
Functionalized STM-tip
Ultrathin insulating films
Cl-functionalized scanning tunneling microscopy (STM) tips are fabricated by modifying a tungsten STM tip in situ on islands of ultrathin NaCl(100) films on Au(111) surfaces. The functionalized tips are used to achieve clear atomicresolution imaging of NaCl(100) islands. In comparison with bare metal tips, the chemically modified tips yield drastically enhanced spatial resolution as well as contrast reversal in STM topographs, implying that Na atoms, rather than Cl atoms, are imaged as protrusions. STM simulations based on a Green’s function formalism reveal that the experimentally observed contrast reversal in the STM topographs is due to the highly localized character of the Cl-pz states at the tip apex. An additional remarkable characteristic of the modified tips is that in dI/dV maps, a Na atom appears as a ring with a diameter that depends crucially on the tip-sample distance.
2019-06-20T07:35:34Z
2019-06-20T07:35:34Z
2015-07
2019-06-20T07:35:34Z
artículo
Nano Research 8(7): 2223-2230 (2015)
http://hdl.handle.net/10261/184448
10.1007/s12274-015-0733-y
http://dx.doi.org/10.13039/501100004543
http://dx.doi.org/10.13039/501100001659
http://dx.doi.org/10.13039/501100004837
http://dx.doi.org/10.13039/501100003329
eng
https://doi.org/10.1007/s12274-015-0733-y
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-47878-C2-R
closedAccess
Springer